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Pinpoint Test B: No Power In Acc

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. B1 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING.
    • Is the ignition switch OK? 
    1. YES  : Go to  B2.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
  2. B2 CHECK FOR VOLTAGE AT THE SJB 
    • Key in OFF position.
    • Disconnect: SJB C2280a
    • Key in ACCESSORY position.
      • Fig 1: Measuring Voltage Between SJB C2280A-11, Circuit 1002 And Ground
      GF0015983Courtesy of FORD MOTOR CO.
    • Measure the voltage between SJB C2280a-11, circuit 1002 (BK/PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B4.
    2. NO  : Go to  B3.
  3. B3 CHECK CIRCUIT 1002 (BK/PK) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250
      • Fig 2: Checking Circuit 1002 (BK/PK) For Open Or Short To Ground
      GF0015984Courtesy of FORD MOTOR CO.
    • Measure the resistance between:
      • SJB C2280a-11, circuit 1002 (BK/PK), harness side and ignition switch C250-6, circuit 1002 (BK/PK), harness side.
      • SJB C2280a-11, circuit 1002 (BK/PK), harness side and ground.
    • Are the resistances less than 5 ohms between the SJB and the ignition switch, and greater than 10,000 ohms between the SJB and ground? 
    1. YES  : Go to  B4.
    2. NO  : VERIFY SJB fuses 3 (10A) and 7 (10A) are OK. If OK, REPAIR circuit 1002 (BK/PK). If not OK, refer to the appropriate SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  4. B4 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Check SJB C2280a for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: SJB C2280a
    • Make sure the connector seats correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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